Initial

server/services/importExport.js

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+const path = require('path');
+const readXlsxFile = require('read-excel-file/node');
+const writeXlsxFile = require('write-excel-file/node');
+const Papa = require('papaparse');
+const { XMLBuilder, XMLParser } = require('fast-xml-parser');
+const { now } = require('../db');
+const { assetExportRows } = require('./assets');
+
+async function rowsFromImport(format, buffer) {
+  const text = buffer.toString('utf8');
+  if (format === 'json') {
+    const parsed = JSON.parse(text);
+    return Array.isArray(parsed) ? parsed : parsed.assets || [];
+  }
+  if (format === 'xml') {
+    const parsed = new XMLParser({ ignoreAttributes: false }).parse(text);
+    const assets = parsed.assets?.asset || parsed.MixedAssets?.assets?.asset || [];
+    return Array.isArray(assets) ? assets : [assets];
+  }
+  if (format === 'xlsx' || format === 'xls') {
+    const rows = await readXlsxFile(buffer);
+    const headers = (rows.shift() || []).map((header) => String(header || '').trim());
+    return rows.map((row) => Object.fromEntries(headers.map((header, index) => [header, row[index]])));
+  }
+  return Papa.parse(text, { header: true, skipEmptyLines: true }).data;
+}
+
+async function assetExport(format) {
+  const rows = assetExportRows();
+  if (format === 'csv') {
+    return {
+      contentType: 'text/csv',
+      filename: 'mixedassets-assets.csv',
+      body: Papa.unparse(rows)
+    };
+  }
+  if (format === 'xlsx') {
+    const columns = Object.keys(rows[0] || {
+      asset_id: '',
+      description: '',
+      category: '',
+      status: '',
+      acquisition_cost: '',
+      in_service_date: ''
+    });
+    const sheetData = [
+      columns.map((column) => ({ value: column, fontWeight: 'bold' })),
+      ...rows.map((row) => columns.map((column) => ({
+        value: typeof row[column] === 'object' && row[column] !== null ? JSON.stringify(row[column]) : row[column]
+      })))
+    ];
+    return {
+      contentType: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+      filename: 'mixedassets-assets.xlsx',
+      body: await writeXlsxFile(sheetData).toBuffer()
+    };
+  }
+  if (format === 'xml') {
+    return {
+      contentType: 'application/xml',
+      filename: 'mixedassets-assets.xml',
+      body: new XMLBuilder({ format: true }).build({ assets: { asset: rows } })
+    };
+  }
+  return {
+    contentType: 'application/json',
+    filename: 'mixedassets-assets.json',
+    body: JSON.stringify({ exportedAt: now(), assets: rows })
+  };
+}
+
+function extensionForUpload(fileName) {
+  return path.extname(fileName).replace('.', '').toLowerCase() || 'csv';
+}
+
+module.exports = {
+  assetExport,
+  extensionForUpload,
+  rowsFromImport
+};